S. A. Syurin
Northwest Public Health Research Center
Russian Federation

Sergei A. Syurin, Dr. Sci. (Med.), Senior Researcher, Department of Hygiene

4, 2^nd Sovetskaya Street, Saint Petersburg, 191036

A. A. Kovshov
Northwest Public Health Research Center; North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Aleksandr A. Kovshov, Cand. Sci. (Med.), Head of Occupational Hygiene Department, Senior Researcher; Associate Professor, Department for Hygiene of Educational, Training, and Labor Conditions, and Radiation Hygiene

4, 2^nd Sovetskaya Street, Saint Petersburg, 191036

41, Kirochnaya Street, Saint Petersburg, 191015